fix: remove unneeded dependency from requirements

[wenxi-onyx]

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Project	Deployment	Preview	Comments	Updated (UTC)
internal-search	Ready	Preview	Comment	Sep 10, 2025 9:44pm

[greptile-apps]

Greptile Summary

This PR removes the langchain-community==0.3.21 dependency from backend/requirements/default.txt. The change represents a strategic cleanup of the dependency footprint, aligning with LangChain's architectural evolution. Starting from LangChain 0.2.0, the project officially recommends removing the dependency on langchain-community from the main langchain package. The Onyx codebase has evolved to use langchain-core (version 0.3.51) for essential functionality like message types and interfaces, while implementing custom LLM integrations through litellm rather than relying on community-maintained langchain integrations. This change reduces the security surface area and dependency complexity while maintaining all necessary functionality through langchain-core and the existing custom implementations. The remaining dependencies langchain-core==0.3.51 and langchain==0.3.23 provide all the required LangChain functionality for the codebase.

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Confidence score: 4/5

• This PR is safe to merge with minimal risk as it removes an unused dependency without affecting functionality
• Score reflects careful analysis showing no direct imports from langchain_community in the codebase and proper retention of required langchain-core functionality
• Pay close attention to runtime testing to ensure no hidden dependencies exist that weren't caught in static analysis

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[cubic-dev-ai]

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